Apparatus for covering cores



1941- o. G. NELSON APPARATUS FOR COVERING CORES Filed Feb. 15, 1941 Patented Dec. 16, 1941 TENT oFFIcE-i} 2,266,438 Y 7 APPARATUS FOR COVERING corms I Oscar G. Nelson; Baltimore, assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application February 15,1941, serial No. 379,093

, 7 Claims.

[This invention relates to apparatus forcovering. cores,'and more particularly to apparatus for applyingmetal tape spirally'to continuous cores, such as electric cables or the like.

Objects of the invention are to provide, in'an apparatus of the aforementioned type; a simple;

the said brake mechanism being constructed and arranged sojthat its braking action diminishes as the diameter of the tape supply roll decreases.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in

Fig. 1 isan elevational View, partly in section, of a tape serving head embodying the features of the. invention; and s Fig. 2 is an end view thereof, partly in section, looking in the direction of the arrows online 22 of Fig. 1,

The serving head illustrated in the drawing comprisesa rotary flier Ill consisting of a circular plate H having 'a concentric tubular hub l2 on one side thereof upon which a tape supply holder 14 is rotatably mounted. On its opposite side, thecircular plate is provided with two diametrically opposed earsor lugs l5---l5, by means of which it is attached by a yoke IE to a tubular driving-shaft 'journalled in a suitable supporting' frame or standard I8, a portion of which is shown-in Fig.1 i J l "Thtape'supply holder comprises a circular plate having a concentric tubular hub 2|, which is rotatable-on the hub l2 of the flier. -A retaining-collar 23 is attached to the end of the hub l2 to prevent axial displacement of the tape supply holder. This holder is adapted to hold a pad or roll25 of metal tape 26. The roll of tape is placed'upon the hub 2| of the holder and its tubular core'is clamped against the plate 23 of the holder by means of a cylindrical retaining nut 28-threaded on' the hub. The retaining nut has 1' an: outwardly extending circumferential fiange'29, to which a series of radial arms 30, 30 are welded; which serve to holdthe tape supply roll against the plate 20 as the tape is withdrawn from the roll.-' It is obvious, of course, that any other suitable means may be provided for holding the roll of tape on the tape supply holder.

Within the hub I2 of the flier l6, there is secured a tube 3!, to which two diametrically op posed parallel rods 32-32 are attached. These rods support a sizing die holder 33, which is equipped with a sizing die 34. One of the rods also supports a tape guiding member 35, by means of which the tape is applied to a core or cable 31 at the desired angle as the cable is advanced through the rotating flier in the direction indicated by the arrow 38 inFig; l. The tapeis guided from the supply roll to the-guide by two flanged rollers 39 and 4B.

Secured to or formed integral with the tape supply roll holder [4 is a concentric brake drum 42, which is frictionally engaged by a brake shoe 43, asbest shown in Fig. 2. The brake shoeis pivotallycarried by an arm 44-keyed to a tubular shaft 45 (Fig. l) which is rotatably journalled in a bearing 45 fixed to-the' flier I5 near its periphery. A shaft 48 is rotatably journalled interme-- diate its ends in the tubular shaft 45, and an arm '5flis attached' at one end to one end 'of the. shaft; 48 and-carrie a roller 5|- at its opposite end." This roller is adapted'to-ride on the periphery'otthe roll of tape; as best shown in Fig. 2.. The roller is pressed against the tape roll and'the brake slgroe-is pressed against the brakeldrum by atorsionfsprin g52 (Fig.2) which is adjustable:

to varythe braking pressure in the manner hereinafter described. 1 i

' A ratchet-disk 53, having a hub 54, is, keyed. to the inner shaft 48 and a'co'operating ratchet disk 56, "having a hub 51, is rotatable on the hub'ofv ratchet disk 53. The opposing faces of the two ratchet disks are provided with interlockingte'eth;

58, 58. The torsion spring '52 surrounds the hub 51 of ratchet disk 56 and is compressed between this ratchet disk and a flange 59 on tubular shaft,

45. Ratchet disk 56 is thus pressed into interlocking engagement with ratchet disk 53, and since the latter is keyed to inner shaft 48, this shaft and roller carrying arm 56 are constrained to rotate with ratchet disk 56.

One end of torsion spring 52 'is attached to ratchet disk 56 and its opposite end is attached to flange 59 of tubular shaft 45. The spring .is tensioned so-that it presses brake shoe 43 against brake drum 42 and also presses the roller 5| against the periphery of the tape supply roll. The braking pressure exerted by the spring may be adjusted by simply turning ratchet disk 5t" relative to ratchet disk 53.

In the operation of the apparatus, the serving head is rotated around the advancing cable in the direction indicated by the arrow 60 in Fig. 2. The tape is thus drawn from the supply roll and spirally wrapped around the cable. At the beginning of the rotation of the serving head, theinitial braking pressure exerted by the spring pressed brake shoe 43 on the brake drum 42 is suflicient to overcome the inertia of the tape supply roll and cause it to start rotating with the flyer I9. Due to the action of centrifugal force on the brake shoe, the braking pressure exerted by the brake shoe on the brake drum decreases as the speed of; rotation of the serving head: increases. As the diameter of the tape supply roll decreases, the roller carrying arm 50 moves toward the axis of the serving head, as illustrated in broken line in Fig. 2. or reduces the tension of the torsion spring 52,

thereby reducing the braking-pressure exertedbyi the brake shoe on the brake drum. Thus, the

braking pressure decreases as the tape upply roll decreases in size, and since, as. pointed-out above; the braking pressure also decreases as the speed of rotation of the taping head increases, the tapeis, applied to cable at a uniform tension. at all times;

It should; be understood that the invention is.

not liIIll ed to the particular embodiment thereof herein illustrated and described, but'is capable of other applications within the scope. of the app de aims- Wh t s. cl m 1 In an apparatus for covering cores, a rotat able serving head, a holder rotatable on said head and adapted to support a supply roll of serving material, braking means responsive. to.

therewith, a brake shoe responsive; to the action;

of centrifugal force frictionally engaging said brake drum, and; means responsivetoreductions in the size. of the supply roll for decreasing the.

pressure exerted by. said-brake shoe on saidbrake drum.

3. In an apparatus for covering cores, a set-ving. head mounted for rotationabout an axis coaxial with a core to be covered, a covering mate.- rial: supply. roll. holder rotatably mounted on said serving head, a coverin material; supply roll 00- axially mounted on, said; holder and rotatable therewith, braking means mounted, on the serving head for exerting, a braking pressure onv the supply roll holder, said. braking means being re sponsive to the action, of centrifugal; force thereon. for varying the braking pressure exerted.

thereby on said holder in: accordaneewith variations in the rotating, speed; of; the serving head, and means responsive to the decreasing sizeof the supply roll, as the material is withdrawn therefrom, for decreasing the bralging pressure,

exerted by the braking means onsaid, supply. roll holder.

4. In an apparatus for covering; cores, a serving head mounted for rotation about an axis: coax,- ialwith a core to be covered, a covering material supply roll holder rotatably mountedzqn said head coaxially therewith, a; covering; material supply roll coaxially mounted. on said; holder and rotatable therewith, braking means comprising a brake arm pivotally mounted on the serving-head and adapted toexert a braking pressure on the supply roll holder, said brake arm being respom.

This partially relieves sive to the action of centrifugal force thereon for varying the braking pressure exerted thereby on said holder in accordance with variations in the rotating speed; of the serving head, and means engaging the periphery of the supply roll and movable in response to the decreasing diameter thereof, as the material is withdrawn therefrom, for decreasing. the braking pressure exerted by the brake arm on said supply roll holder.

5. In: an apparatus for covering cores, a serving head mounted for rotation about an axis coaxialwith a core to be covered, a covering material supply roll: holder rotatably mounted on said head coaxially therewith, a covering material supply roll coaxially mounted on said holder and rotatable therewith, and braking means comprising a. brake drum. coaxially. rotatable with said, holder, a brakearm, mounted on, the serving head for exerting a braking pressure on said brake-drum, said, brakearm being responsive to the action of. centrifugal force thereon, for varying hebmkin Pre ure e t d t ereby saidbrake drum in accordance. with varial i ilfiih, the rotating speed of the. serving. head, and means engaging, the periphery of the supply. roll and responsive to the decreasing diameter there of, as the material is withdrawn therefrom, for decreasing the braking pressure exerted by the brakenarm on said brake-drum.

6. In. an, apparatusifor covering cores, a. serve. in head mounted for rotation about an axisco; axial. with a core to be covered, a covering ma: terial supply. roll holder rotatably mounted on said, head coaxially therewith, a covering mates.

. rial supply, roll coaxially mounted onsaidholderand rotatable therewith} a brake. dnum coaxially rotatable with said-holder, a, brake arm pi otallymounted on the serving head for engagement with the brake drum, said. brake arm being, responsiveto, the action, of centrifugal, force thereon for varying the braking pressure exerted thereby, on said. brake. drum, a, follower arm pivotally m n e n e. ser i h a coam lr with the brake arm and adapted to ride on the, pe p e of: i n l roll, d. a o on: prin interconnecting said, brake arm and, said, follower arm for pressing the brakearm againstthe brake. r m nd, on. d n heol ow m, a ain t t swarm- 7. In an apparatus for. covering. cores, aserv ing head mountedfor rotation aboutanlaxiscoe. axialwith a core to be covered, a coueringmata. al. se a s r 11 ho r;Mamm ounted n sai head; coaxially therewith, a. covering material supply roll coaxially mounted on saidholderj and,

o atable t erew ma br ruma a r oa a le th aid holder; a; a e; 33 1 pivotally, nisdr n; th erv ng,- ead; for. en a me tw th t e. b ake drums a. s n r: nre s nea hea ainst the. rak rum s id rake:-

h ks a. arm. bein responsive to the agtion fennu -mea rce thereon. for varying the braking fgrgeiqg:

e S r n; accordance with. variations the r t t n sp ed; of he serv n head and a; fob: qwer. arm p v tally mount d:Qntheserving-h adcoaxially with the brake arm nd held by. the. springa ainst; theper phsry f hesupp xrolis that, the force, orthesp ing decreasesinac o cj; an with the d c sinas ze or the supply r011: asthe material is. withdrawn t er fr m. I

. OSCAR. G. NELSON.- 

